Corrected order of trainStrategy applications : removed possibility of parameter reset before dynamic example extracting

Removed pretrainedEmbeddings as a global parameter, instead submodules can now have their own pretrained w2v

mcd file is now longer needed, we can give mcd throught program argument, use the default one, or read it from conllu file metadata

Checkpoints are created after each training epoch and it is possible to resume a training by training again on the same directory